Ultralow wear Perfluoroalkoxy (PFA) and alumina composites

Sidebottom, Mark A.; Pitenis, Angela A.; Junk, Christopher P.; Kasprzak, Daniel J.; Blackman, Gregory S.; Burch, Heidi E.; Harris, Kathryn L.; Sawyer, W. Gregory; Krick, Brandon A.

doi:10.1016/j.wear.2016.06.003

Cited by 42 publications

(34 citation statements)

References 63 publications

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“…These stages would be repeated by reciprocating motion of cylinders. PFA film is known to have, not only the most negativity in triboelectric series (so that the largest amount of charges is generated by triboelectrification), but also abrasion resistance and mechanical durability [13,14,15]. The novel triboelectric and mechanical properties of PFA allow for STEG to have a high output performance with a very long lifetime [16,17].…”

Section: Resultsmentioning

confidence: 99%

Cylindrical Free-Standing Mode Triboelectric Generator for Suspension System in Vehicle

et al. 2018

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The triboelectric generator (TEG) is a strong candidate for low-power sensors utilized in the Internet of Things (IoT) technology. Within IoT technologies, advanced driver assistance system (ADAS) technology is included within autonomous driving technology. Development of an energy source for sensors necessary for operation becomes an important issue, since a lot of sensors are embedded in vehicles and require more electrical energy. Although saving energy and enhancing energy efficiency is one of the most important issues, the application approach to harvesting wasted energy without compromising the reliability of existing mechanical systems is still in very early stages. Here, we report of a new type of TEG, a suspension-type free-standing mode TEG (STEG) inspired from a shock absorber in a suspension system. We discovered that the optimum width of electrode output voltage was 131.9 V and current was 0.060 µA/cm2 in root mean square (RMS) value while the optimized output power was 4.90 μW/cm2 at 66 MΩ. In addition, output power was found to be proportional to frictional force due to the contact area between two frictional surfaces. It was found that the STEG was made of perfluoroalkoxy film and showed good mechanical durability with no degradation of output performance after sliding 11,000 times. In addition, we successfully demonstrated charging a capacitor of 330 μF in 6 min.

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Section: Resultsmentioning

confidence: 99%

Cylindrical Free-Standing Mode Triboelectric Generator for Suspension System in Vehicle

et al. 2018

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“…However PFA has comparable mechanical, thermal and chemical characteristics as PTFE, owing to this PFA has rarely been considered in tribological applications. The deficiency of tribology application of PFA composites is also due to the augmented cost as a comparison to PTFE [121][122][123]. Sidebottom et al [121] studied wear and frictional performance of PFA coating over PTFE coating.…”

Section: Poly[tetrafluoroethylene-co-(perfluoroalkyl Vinyl Ether)] Ormentioning

confidence: 99%

“…The deficiency of tribology application of PFA composites is also due to the augmented cost as a comparison to PTFE [121][122][123]. Sidebottom et al [121] studied wear and frictional performance of PFA coating over PTFE coating. The preliminary frictional coefficient (average over initial 1000 cycles) for virgin PFA was 0.29 and it gradually decreased over time to a concluding value of 0.24.…”

Section: Poly[tetrafluoroethylene-co-(perfluoroalkyl Vinyl Ether)] Ormentioning

confidence: 99%

“…Mateus et al [121] also tried to analyze the wear resistant characteristics of thermal sprayed ceramic (Al 2 O 3 -TiO 2 )-polymer PFA and PTFE composite coating on an aluminum substrate. During ball and disc test, ceramic(Al 2 O 3 -TiO 2 )-8 vol% PFA showed much lower friction coefficient of 0.2 than that of ceramic (Al 2 O 3 -TiO 2 )-8 vol% PTFE composite coating.…”

Section: Poly[tetrafluoroethylene-co-(perfluoroalkyl Vinyl Ether)] Ormentioning

confidence: 99%

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A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

2019

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Galling is the surface phenomenon which involves adhesion of local contact points and creation of protrusions on the juxtaposition of surfaces owing to high friction, inappropriate tribological loading, starved lubrication and high contact pressure (~ 1000 kPa). All these factors result in severe plastic deformation varying from 8000 to 10,000 µε (ε-strain) and diffusion of materials into one another, which consequently results in fatigue wear, surface roughness, tribocorrosion and seizing up of critical parts. The aim of the review is to analyze and summarizes the issue of galling, concurrently it also deals with the novel and economical mitigation method i.e. use of fluorine based coatings e.g. PTFE, owing to their lowest friction coefficient from 0.02 to 0.2 among other solids, high stiffness, high thermal stability and non-adherent characteristics that augments the mechanical and tribological properties and concurrently protect against hostile environments that eventually upsurges the life of components.

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“…PFA exhibits nearly the same unique properties as PTFE since only a small amount of PPVE is added. PFA has a larger coefficient of friction than PTFE, but it is still lower than many bulk polymers and can be used for a wide range of operating temperatures [5,6].…”

Section: Introductionmentioning

confidence: 99%

The Tribological and Sealing Properties of PFA Composites

Quan

et al. 2018

International Journal of Polymer Science

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The polytetrafluoroethylene (PTFE) and perfluoroalkoxyperfluoropropyl vinyl ether (PFA) composites were prepared using carbon fiber (CF) and glass fiber (GF) as fillers. The effects of these fillers on the tribological and sealing properties were investigated. The tribological and sealing properties of the composites were evaluated by a wear tester and a seal test rig. Results showed that the incorporation of CF and GF both improved the wear resistance with composites, approaching wear rates as low as 10−6 mm3/N·m and lowered the seal’s leakage of the PTFE/PFA composites. As described here, CF was more effective than GF in improving the wear rate. Notably, the wear rate of the PFA/CF composite is much less than that of the PTFE composites as the transfer film on the couple ring is much more unique, thick, smooth, and compact. The leakage of carbon fiber-filled PFA composite seal was lowered to 66% less than the traditional PTFE composite seals, which indicates better sealing properties.

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Ultralow wear Perfluoroalkoxy (PFA) and alumina composites

Abstract: 2016-11-03T14:11:40

Cited by 42 publications

References 63 publications

Cylindrical Free-Standing Mode Triboelectric Generator for Suspension System in Vehicle

Cylindrical Free-Standing Mode Triboelectric Generator for Suspension System in Vehicle

A review: advancements in fluoro-based polymers for aggrandizing anti-galling and wear resistant characteristics

The Tribological and Sealing Properties of PFA Composites

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